package com.example.tests;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import com.thoughtworks.xstream.XStream;

import static com.example.tests.TestBase.generateRandomString;

public class GroupDataGenerator {

	public static void main(String[] args) throws IOException {
		if (args.length < 3){
			System.out.println("Please specifi parametrs: <amount of fest data>"
                    + " <file> <format>");
		}
		int amount = Integer.parseInt(args[0]);
		File file = new File(args[1]);
		String format = args[2];
		
		if (file.exists()){
			System.out.println("The file [ "+file+" ] is alredy exists, please remove if manually");
			return;
		}
		
		List<GroupData> groups = generateRandomGroups(amount);
		if ("csv".equals(format)){
			saveGroupsToCsvFile(groups, file);
		} else if ("xml".equals(format)) {
			saveGroupsToXmlFile(groups, file);
		}
		else {
			System.out.println("Unknow format: "+format);
		}
	}
	
	/************************************************************************/
	
	private static void saveGroupsToXmlFile(List<GroupData> groups, File file) throws IOException {
		XStream xstream = new XStream();
		xstream.alias("group", GroupData.class);
		String xml = xstream.toXML(groups);
		FileWriter writer = new FileWriter(file);
		writer.write(xml);
		writer.close();
	}

	public static List<GroupData> loadGroupsFromXmlFile(File file) {
		XStream xstream = new XStream();
		xstream.alias("group", GroupData.class);
		return (List<GroupData>) xstream.fromXML(file);
	}

	private static void saveGroupsToCsvFile(List<GroupData> groups, File file) throws IOException {
		FileWriter writer = new FileWriter(file);
		for(GroupData group : groups){
			writer.write(group.getName()+","+group.getHeader()+","+group.getFooter()+";\n");
		}
		writer.close();
	}

	public static List<GroupData> loadGroupsFromCsvFile(File file) throws IOException {
		List<GroupData> list = new ArrayList<GroupData>();
		FileReader reader = new FileReader(file);
		BufferedReader bufferedReader = new BufferedReader(reader);
		String line = bufferedReader.readLine();
		while (line != null){
			String[] part = line.split(",");
			GroupData group = new GroupData()
				.withName(part[0])
				.withHeader(part[1])
				.withFooter(part[2]);
			list.add(group);
			line = bufferedReader.readLine();
		}
		reader.close();
		return list;
	}

	/******************************************************************************/
	
	public static List<GroupData> generateRandomGroups(int amount) {
		List<GroupData> list = new ArrayList<GroupData>();

		for (int i = 0; i < amount; i++){
			GroupData group = new GroupData()
			 .withName(generateRandomString())
			 .withHeader(generateRandomString())
			 .withFooter(generateRandomString());

			list.add(group);
		}
		return list;
	}
}
